.header{
	width: 100%;
	height: 35px;
	border-bottom: 1px solid #ddd;
}
.header span{
	float:right;
}
.menu_left ul{
	list-style-type:none;
	border: 1px #f1f1f1 solid;
	width:300px;
	height:100%;
    margin: 0;
    padding: 0;
	background-color: #f1f1f1;
}

.menu_left ul li{
	width:300px;
}

.menu_left ul li a {
    display: block;
    color: #000;
    padding: 8px 16px;
    text-decoration: none;
}
.menu_left .active {
	 background-color: #4CAF50;
    color: white;
}

.menu_left ul li a:hover {
    background-color: #4CAF50;
    color: white;
}